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The Taillefer Massif is geomorphologically quite distinct, forming an extension of the Oisans crystalline massif, from which it is separated by the southern end of the intra-Dauphinois sedimentary trough. In the Quaternary, during strong advances of the glaciers (Riss), the Taillefer massif was isolated by two transections (or dividing ridges) perched between Romanche and Bonne: Morte-Roizonne to the west and Ornon-Malsanne to the east.

The high relief (2857 m/9373 ft) and distinct topography make this a hiking area that is highly appreciated by Grenoble residents.

The Taillefer is amajor feature on the distant horizons of Grenoble and the closer horizons of Matheysine, and is attractive to nature lovers for its accessibility and its exceptional panoramic views over Oisans, Belledonne, the Alpine trench, Matheysine and Valbonnais.

The crestline of the massif has a relaxed appearance, but in reality it is formed by steep and relatively lengthy ridges, posing risks that must be taken into account if they are linked to the more visited parts of the mountains.

The Poursollet lakes area is a favourite for weekend getaways from Grenoble, and combines sweeping, panoramic views with a landscape of lakes, meadows and weeping willow and alder woodlands, depending on the different vegetation levels.

The resort at L'Alpe-du-Grand-Serre is a starting point for other types of nature visits. It is built on a bank accessible by D 114, which, starting from Séchilienne, is steep and difficult, though easier starting from the Mure through the Roizonne Valley. The resort built its first ski lifts on the steep pastureland of the eastern slope of the Grand Serre, which provides views over the Taillefer and the Armet; it then installed additional facilities on the western slope of the mountain, which connect its guests with Matheysine through the beautiful valley of the Laffrey lakes.